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Numerical Simulation of Microstructure Evolution During the Solid Phase Transformation of Ti-6Al-4V Alloy in Investment Casting |
Heng SHAO1, Yan LI2, Hai NAN2, Qingyan XU1() |
1 Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China 2 Beijing Institute of Aeronautical Materials, Beijing 100095, China。 |
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Cite this article:
Heng SHAO, Yan LI, Hai NAN, Qingyan XU. Numerical Simulation of Microstructure Evolution During the Solid Phase Transformation of Ti-6Al-4V Alloy in Investment Casting. Acta Metall Sin, 2017, 53(9): 1140-1152.
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Abstract Investment casting is widely used in producting complex thin-wall titanium alloy components. In this process, the β→α phase transformation decides the final microstructures of these components. However most of present studies on phase transformation of titanium alloys focus on the microstructure evolution in heat treatment process or after deformation rather than in casting process now. It is a main reason only this work aims at the solid phase transformation of Ti-6Al-4V alloy in investment casting. In this work, the growth model of edge of α phase plates based on multi component Zener-Hiller model, and the growth model of broad face of α phase plates based on diffusion and conservation of multi components were established. The growth competition of different colonies, which consist of α phase plates in same orientation, was simulated and the microstructures and their evolution with temperature were obtained. The comparison between simulated microstructures and their evolution with temperature and experimental data indicated that the proportion of undercooling degree caused by impurities in the alloy is about 45% of the total undercooling degree in broad face of α phase plates and a much smaller portion in edge of α phase plates. The comparison also showed that the enthalpy change of solid phase transformation of titanium alloy is about 70 kJ/kg. The simulated and experimental morphologies look like similar and the simulated growth rate is also in good accordance with experiment inferred growth rate.
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Received: 28 December 2016
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Fund: Supported by China-EU (European Union) Science & Technology Cooperation in Aviation, Horizon 2020 Framework Programme for Research and Innovation (2014-2020) of EU, National Basic Research Program of China (No.2011CB706801), National Natural Science Foundation of China (Nos.51171089 and 51374137), National Science and Technology Major Project (No.2012ZX04012011) and High Technology Research and Development Program of China (No.2007AA04Z141) |
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